self-assured
US /ˌself əˈʃʊrd/
UK /ˌself əˈʃʊrd/

1.
percaya diri, yakin
confident in one's own abilities or character
:
•
She walked into the room with a self-assured smile.
Dia masuk ke ruangan dengan senyum percaya diri.
•
His calm and self-assured demeanor impressed everyone.
Sikapnya yang tenang dan percaya diri membuat semua orang terkesan.